header {
  overflow: hidden;
  height: 2rem;
  border-bottom: 1px solid #e8e6e6;
  background-color: #fff;
  text-align: center;
  line-height: 2rem;
  position: relative;
  font-size: 1rem;
  font-weight: 700;
}
header a {
  position: absolute;
  left: 0.7rem;
  color: #afafaf;
}
header a img {
  position: absolute;
  top: 0.3rem;
  width: 0.7rem;
}
